good stuff mate, hope it goes well! ;) how much they charged supplied and fitted? should be around £160 ish?
Good chance it'll be put less then that. Module is reletively cheap, and to remove wheel and replace would take an hour approx.
Might get the part under warranty?? not sure.
Underlying fact is if it costs that then thats ok. The Nav cost me £480. My old MFD2 will fetch close to £300, so to get an RNS510 installed for total costs around £300, i cant argue